Hi. My Elitebook was factory installed with windows 7, but had a free upgrade to windows 10 included. I successfully upgraded to windows 10 no problems and ran windows 10 for the last couple of years. The last couple of days my system completely crashed and I have had to reformat it and use theHP recovery tool to get it operating again. But - it returned it to Windows 7, not Windows 10. So my question is how do I recover my free upgrade to windows 10 ?